Set of stereo pictures on re-usable drawing pads, early 20th century.

Set of stereo pictures on re-usable drawing pads, early 20th century.
2 9 c m
40cm
actual image size: 32cm x 21cm

Description

These cards, manufactured by Theodore Hamblin Ltd, England, were used for training an eye to share equally in the task of binocular vision, instead of one eye doing bulk of the work. Amblyopia is the name for the condition where one eye is 'lazy', forcing the other to work harder.

© Science Museum / Science & Society Picture Library

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